Tentukan 4suku pertama bar is an bilangan yang dirumuskan Un=n(2n²-1) hasilnya berapa

U4=2².4-1
U4=16-1
U4=15n

Un = n(2n²-1)

Un = n(2n²-1)
U1 = 1(2(1)²-1)
U1 = 1(2-1)
U1 = 1(1) = 1

Un = n(2n²-1)
U2 = 2(2(2)²-1)
U2 = 2 (8-1)
U2 = 2 (7) = 14

Un = n(2n²-1)
U3 = 3 (2(3)²-1)
U3 = 3 (18-1)
U3 = 3 (17) = 51

Un = n(2n²-1)
U4 = 4 (2(4)²-1)
U4 = 4 (2(16) -1)
U4 = 4 (32-1)
U4 = 4 (31) = 124

Semoga membantu... ^_^